Add rust client to echo-actorless

- Make it easier for users to find rust code they can use for the client
- Remove the need to install websocat to get cli

websockets/echo-actorless/README.md

@@ -8,7 +8,7 @@ Simple echo websocket server using [`actix-ws`].
 
 ```sh
 cd websockets/echo-actorless
-cargo run
+cargo run --bin websocket-server
 # starting HTTP server at http://localhost:8080
 ```
 
@@ -16,6 +16,13 @@ cargo run
 
 Go to <http://localhost:8080> in a browser.
 
+### rust client
+
+```sh
+cd websockets/echo-actorless
+cargo run --bin websocket-client
+```
+
 ### CLI Client
 
 ```sh